The shirt has a barely discernible side slit with Velcro through which, he said, he can yank his Colt 1911 from his waistband holster.
IMHO Velcro can only get in the way and slow down the presentation of the weapon in an emergency.
Sometimes odds of drawing may be low enough that concealment is, balancing probabilities & consequences, paramount.
That's OK - he's not going to be carrying a 1911 on an elastic waistband for very long...
Heh.